Emlid Reach RS4 Pro
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Reach RS4 Pro All-Band GNSS Receiver
Professional-grade GNSS receiver with dual cameras and AR guidance
Overview
The Reach RS4 Pro is a professional-grade GNSS receiver designed for high-precision surveying and mapping applications. With multi-band support, tilt compensation, dual cameras for AR guidance, and robust connectivity options, it delivers centimeter-level accuracy in the most challenging environments.
Stake Out Faster with AR Guidance
With the RS4 Pro, stakeout becomes visual. Rather than simply following coordinates on a map, your designs are directly overlaid on the real world, clearly showing where to place stakes.
Dynamic Navigation
Intuitive guidance to your target points
Auto Bullseye View
Automatically aligns with your target
Cut & Fill Indicator
Visual representation of elevation differences
Quick Point Switch
Seamlessly move between points
Crews can work faster with AR guidance, even on complex construction sites and roadworks.
Measure from Images
Even if you can't put the pole there, you can still measure it with your RS4 Pro. Use the cameras to measure building facades, areas behind fences, across busy roads and any other inaccessible points.
Save time setting up a total station and avoid hazardous areas.
Across water
Behind fences
Over traffic
Above pits
Past hedges
Around machinery
Unmatched Precision, Even Under Canopy
The Reach RS4 Pro delivers centimeter-level accuracy, even in challenging environments like forests or urban canyons. With support for every GNSS constellation and signal frequency, including the L5 and L6 bands, resistant to multipath and interference, the Reach RS4 Pro locks onto 40+ satellites simultaneously using 672 channels.
Next-Gen Tilt Compensation
The advanced tilt compensation stays accurate even at steep angles. For example, at a 30° tilt, the Reach RS4 Pro still delivers 18 mm precision. Initialization takes just a few quick movements and remains stable throughout the job—no manual recalibration needed.
Factory-Calibrated
Ready to use out of the box
Interference-Proof
Reliable in challenging environments
Rapid Initialization
Quick setup for immediate use
Unlimited Tilt Angles
Works at any angle
Engineered for the Harshest Environments
Magnesium Alloy Body
Crafted from the same material used in aerospace and high-end tech, offering exceptional strength without extra weight.
16 Hours on One Charge
No need to stop mid-job. Power up via USB-C or plug in a power bank on the go.
Waterproof IP68
Completely sealed against water and debris, ready for rainstorms and dusty sites.
-40 to +65 ºС Range
Performs without compromise in extreme temperatures from cold to heat.
Software to Drive Your Entire Workflow
The Reach RS4 Pro is powered by Emlid Flow—a complete field and cloud solution for iOS and Android. From initial setup to final verification, Emlid Flow keeps your entire team connected, your data synchronized, and your project on track.
Keep Your Team in Sync
- Invite team members, assign roles, and share projects
- Monitor field progress from the office and sync data instantly with the field
- Unified workflows for all team members, consistent interface, no extra training needed
Handle All Types of Fieldwork
- Topographic surveys: capture precise elevation and terrain data
- Stakeout & layout: mark points, lines, and site boundaries
- Line & road work: stake centerlines, offsets, and curves with precision
- Cut & fill calculations: measure stockpiles and earthworks on-site
- As-builts: confirm construction accuracy against design plans
Key Advantages
What's in the Box
The Reach RS4 Pro comes complete with everything you need to start surveying right out of the box:
Specifications
| Precision Static | H: 4 mm + 0.5 ppm V: 8 mm + 1 ppm |
| Precision PPK | H: 5 mm + 0.5 ppm V: 10 mm + 1 ppm |
| Precision RTK | H: 7 mm + 1 ppm V: 14 mm + 1 ppm |
| Tilt Compensation | RTK + 2 mm + 0.3 mm/° |
| Convergence Time | <5 s typically |
| Number of Channels | 672 |
| Update Rates | Up to 10 Hz |
| Emlid Radio | Included |
| LoRa Radio | 868/915 MHz, 0.1W, Up to 8 km |
| UHF Radio | 410-470 MHz, TRIMTALK 450S |
| LTE Modem | Global bands, Nano-SIM |
| Wi-Fi | 802.11a/b/g/n |
| Bluetooth | Bluetooth 5.1 (BR/EDR + LE) |
| Ports | RS-232, USB Type-C |
| Dimensions | 128.6 × 128.6 × 99.3 mm |
| Weight | 920 g |
| Operating Temperatures | -40 to +65 °C |
| Ingress Protection | IP68 |
| Autonomy | 16 hrs as RTK rover with tilt 22 hrs of logging |
| Battery | Li-Ion 5000 mAh, 7.2 V, 36 Wh |
| Charging | USB Type-C (PD): 5V/3A, 9V/3A, 12V/3A, 15V/3A |
| Internal Storage | 16 GB |
| GPS | L1C/A, L2C, L5 |
| GLONASS | L1OF, L2OF |
| Galileo | E1B/C, E5a, E6 |
| BeiDou | B1I, B1C, B2a, B3I |
| QZSS | L1C/A, L1C/B11, L2C, L5 |
| NavIC | L1SPS Data, L5SPS |
| Corrections | NTRIP, RTCM3 |
| Position Output | NMEA, LLH/XYZ |
| Data Logging | RINEX, NMEA, LLH/XYZ, UBX |